Fit guide
How to put on a mask and check the seal.
Read moreStandards
What our products are tested to — and what they are not
This page exists because most respiratory products online are vague about their testing. Here is exactly where each part of our range stands.
Short version: our KN95 dust masks are tested to GB2626-2019. Our reusable facepieces, cartridges, pads and spare parts are not certified to any published standard, and we do not claim otherwise.
Product by product
| Product | Standard claimed | What that means |
|---|---|---|
| KN95 dust masks (DM100, DM200, DM300, DM400) | GB2626-2019, KN95 class | At least 95% filtration efficiency for non-oily particles in laboratory testing |
| Particulate filter pads (FP120) | GB2626-2019, KN95 class | Same class of filter media, tested in pad form |
| Reusable facepieces (RH500, RH520, RF900) | None | General-purpose protective equipment. Sold without a published-standard claim. |
| Activated carbon cartridges (CA210) | None | General-purpose vapor and odor reduction. Sold without a published-standard claim. |
| Maintenance kit (RK100) | None | Spare parts only |
What GB2626-2019 actually is
GB2626-2019 is the Chinese national standard for respiratory protection equipment that filters particles. It sets out how a mask is tested, how much air it must pass while still filtering, and how the filter performs against a standard test aerosol.
The KN95 class inside that standard requires at least 95% filtration efficiency against non-oily particles. That is the entire basis of the claim on our packaging and on this site.
What we do not claim
We do not claim certification to any national or regional standard outside China. Where a marketplace listing, a marketplace review or a competitor suggests that our range carries such a certification, that is not accurate.
We do not claim that our products are medical devices, and they are not intended for medical, healthcare, dental or surgical settings.
We do not claim protection against gases, vapors or oxygen-deficient atmospheres for any product that does not carry a carbon filter, and where a product does carry one, we do not claim a certified protection level.
How to read a filtration number
A filtration efficiency figure describes the filter media in a laboratory. What you actually breathe depends on the fit: a gap at the nose passes far more particles than the filter itself ever will.
That is why the fit guide matters as much as the specification. Every mask and facepiece in the range has fitting instructions, and the reusable facepieces include a seal check you can repeat every time you put one on.